Alberth opened the ticket and wrote:

In revision 12386, the vehicle list of trains visiting the station does not get closed when the station is deleted.

Reproducing the issue: Build a station, click it to get the cargo overview, click the little train at the bottom to get the vehicle list of the station. Select dynamite, delete station with it. After time out, the station sign is deleted from the map, the station cargo window is closed, but the vehicle list window stays open. Its title is changed to 'unknown destination' instead.

If you leave the vehicle list window open, trains of a competitor may appear after some time, presumably when the stationID is re-used.

Reported version: trunk
Operating system: All

This issue was imported from FlySpray: https://bugs.openttd.org/task/1872